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Java Math Exercises: Test if a double number is an integer

Java Math Exercises: Exercise-3 with Solution

Write a Java program to test if a double number is an integer.

Sample Solution:

Java Code:

import java.util.*;
public class Example3 {
 public static void main(String[] args) {
  double d_num = 5.44444;
  if ((d_num % 1) == 0) {
   System.out.println("It's not a double number");
  } else {
   System.out.println("It's a double number");
  }
 }
}

Sample Output:

It's a double number

Flowchart:

Flowchart: Test if a double number is an integer.

Java Code Editor:

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Previous: Write a Java program to get whole and fractional parts from a double value.
Next: Write a Java program to round a float number to specified decimals.

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Java: Tips of the Day

Parsing dates:

import java.io.*;
import java.util.*;
import java.text.*;

String s = "2001/09/23 14:39";

SimpleDateFormat formatter = new SimpleDateFormat ("yyyy/MM/dd H:mm");
Date d = formatter.parse(s, new ParsePosition(0));